OS X Yosemite 10.10.5
How can one upgrade from OS X Yosemite 10.10.5
How can one upgrade from OS X Yosemite 10.10.5
Back up your data, check your applications for compatibility, and depending on which Mac model you have, download El Capitan, High Sierra, Mojave, or Catalina.
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OS X Yosemite 10.10.5